Traversing hoist



March 3, 1942. G. HANIQUET TRAVERSING HoIsT Original Filed De'c. 29, 1938 Eff/E5 s Patented Mar. 3, 1942 TRAVERSING HOIST George Haniquet, Glendale, Calif.

Original application December 29, 1 938, Serial No.

248,353. Divided and this application September 13, 1939, Serial No. 294,756

2 Claims.

This invention relates to improvements in derricks, particularly of the type which can be readily transported from place to place. The particular adaptation in mind of the invention is to telephone work. It is common practice for a telephone erecting crew to raise a telephone pole in the hole by the use of a fairly large number of handled spikes. The improved derrick is adapted to be erected according to a specific arrangement disclosed in an application for patent for Automatic portable derrick, led by George Haniquet, December 29, 1938, Serial No. 248,353,

Y patented October '7, 1941, as Patent 2,258,383, of

which application this is a division.

The foregoing statements are chiey explanatory of the general purpose of the invention. The instant improvement is directly concerned with ground engaging means for the derrick boom, the purpose and advantage of this feature being to compensate for an uneven ground surface so that the boom is certain to be held steady when erected as stated. With this premise in mind the objects of the invention are as follows:

First, to provide a portable derrick with a movable boom that is adapted to be swung into an erect position in reference to a transporting vehicle, the ground end of said boom having leveling means embodied therein by the use of which an uneven surface is compensated for so as to provide a rm foundation for the erect boom.

Second, to supplement said boom with a hook or equivalent detent, whereby the boom is adapted to be fastened down to the transporting vehicle so that when the ground leveling means is actuated the reaction will be upon the transporting vehicle and not against the movable mount of the boom, thus serving to hold the boom far more steady because of its being anchored to the weight of the vehicle, than if mere reliance were put upon the attachment of the boom to its movable mount.

Other objects and advantages will appear in the following speciiication, reference being had to the accompanying drawing in which Figure 1 is a side elevation, parts being shown in section, illustrating the boom in its erect position and particularly illustrating the use of the ground leveling means and of the hook for fastening the boom frame down.

Figure 2 is a longitudinal sectional view of the foot end of the boom.

In carrying out the invention provision is made of a boom generally designated I. This boom comprises an outer'tube 2 of a suitable metal, either round or non-circular in cross section.

This tube is open at its end, particular reference being had herein to the open foot end 4. This so-called end is the one which comprises the foot of the boom when the latter is erected (Fig. 1). x A telescopic tube 5 is slidably fitted in the foot end 4. Attention is directed to Figure 2 for the structural details at this end. The telescopic tube 5 has a heavy internal thread course 6 into which a screw 'I is driven. An adequate volume of material for the desirably heavy cut of this thread course is supplied by a wall cross-section of the tube 5 which is thicker than that of the outer tube 2. This screw has a head 8 which terminates in a ball 9. The ball is swiveled in a socket I I on a foot plate I0. This plate is adapted to rest on the ground (Fig. 1), the ball and socket connection 9, II enabling its adaptation to an uneven ground surface.

A short double-headed rod I2 is slidablytted in a hole I3 in the head 8 of the screw l. This rod is for the purpose of facilitating the turning of the screw I so as to either extend it from the telescopic tube 5 or to drive it in. This provision also compensates for differences in elevation of the ground surface.

Further extension of the foot plate I0 with respect to the boom tube 2 is provided by selectively fitting a key I4 (Fig. 2) into any one of a set of holes I5 in the tube 5. The latter is slotted at I6 and a pin I 1, afiixed at its ends in the tube 2, occupies the slot I5 to limit the extension of the tube 5.

Thus far it is readily seen that when the boom I is erected to its operative position (Fig. 1), the ground leveling means comprising the telescopic tube 5, screwV I and swiveled foot plate I0 is brought into play to provide a firm foundation for the boom. The latter is carried by a transporting vehicle 36 which in this instance comprises a truck. Said truck carries a mount for the boom. Said boom has a frame 54 attached to it by means of at least one bolt 55 which is secured through the collar 56 of a pair of collars 56, 51.

Said collars are parts of a pair of diverging bars 58, 59 which, it will be understood, constitute the foregoing frame 54. Said bars are riveted to extensions 60 of the collars 56, 51, and in order to make the connection of the collars to the tube 2 as secure as possible bolts 6I are applied to draw the pairs of bars and the extensions of the collars tightly together.

The frame 54 isr connected to an elevator mechanism generally designated 62. The details of this mechanism are fully brought out in the application aforesaid, it being sufficient herein to point out that said mechanism includes a shaft 69 on which the frame 54 is turnable. The boom has considerable inherent weight which is naturally augmented by the load put upon it in hoisting. Under ordinary circumstances the boom will adhere only to the ground, but provision is made for certain exigences wherein the boom might possibly rise.

To offset any possible tendency in that direction use is made of a hook |00. This hook is swingable on a pivot |0| that is secured to a part of the frame 54. It is adapted to engage the eye |02 of a plate |03 on the truck 36. The hook has a long handle |04, and after engagement is made with the eye |02 said handle is slipped under a.

spring catch |05, also attached to a portion of. the frame.

The operation is readily understood. The boom is adapted to assume a horizontal position in reference to the truck 36 during transportation. When the occasion arises for erecting the boom (Fig. l), it is simply swung upon its movable mount 62 until the foot plate l0 engages the ground. Inasmuch as the plate is swiveled to the foot end of the boom said plate automatically adapts itself to any uneven ground surface Any necesary extension of the foot plate is produced byturning out the screw l. When the extension of thelatter has reached A the limit afur-ther extension is obtainable byA pulling the tube 5 out and setting the key Ul in a different set of holes I5.

Reference has been made to the mounting of he frame 513 upon the truck 3S. Themounting is done on the rear-end as shown in F-ig. 1 andin actual practice on thenear corner. This-locationof the boom at the right rear corner has the advantage of permitting the truck to be drawn parallel to the curb and still enable the lifting of a heavy pole without overbalancing the truck. The scheme of securing the boom to the bed of the truck by means of the hook |00 and then tightening the ootplate |0- the ground, raises the bed of the truck until most o fA the slack is taken outl of `the springs. Then when a load is applied' to the boom the tendency is to raise the left side ofl the against truck bed only. There is no upward lift to the rear axle until after the rear springs are relaxed, whereupon the weight of the rear axle is added to the truck bed. This is a great asset to the counterbalancing of the load and it occurs by raising the truck bed by means of the adjustable foot plate. Any further upward movement of the truck bed following the relaxation of the rear springs starts the taking on of the weight of the rear axle which more than counterbalances the load, usualy consisting of a pole.

Thus it will be understood that a purposevof the hook is to insure holding the boom down to the ground in the erect position. It seems unnecesasry to further emphasize the holding down function which the truck performs, it being obvious' thatthe weight of the latter is attached to the boom in a sense, thus counterbalancing the load as has already been pointed out. Another reason for using the hook |00, and, obviously, the

eye |02, is to keep the top of the boom from mova load upon a forperiod of removal of the key.

2.` A derrick comprising a boom, and a vehicle platform by which it is transportable, a frame to which the boom is rigidly secured, a shaft upon which the frame is turnably mounted, said shaft being situated near one end of the platform so that the boom can be swung over said edge to rest on the ground, and interconnectible means mutually carried by the platform and a portion of the frame for holding the frame down in respect to the platform and from turning on the shaft,

. GEQRGE HANIQUET 

